id Definition in the Cambridge English Dictionary
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Definition of “id” - English Dictionary

Definition of "ID" - American English Dictionary

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IDnoun [C/U]

 us   /ˈɑɪˈdi/
any ​officialcard or ​document with ​yourname and other ​information on it that you use to ​prove who you are: [U] You need two ​pieces of ID to ​cash a ​check.

I’d

 us   /ɑɪd/
contraction of I had or I would: I’d (= I had) just got in the ​shower when the ​phonerang. I’d (= I would)love to ​see you.
(Definition of ID from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "id" - British English Dictionary

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idnoun [C]

uk   us   /ɪd/ specialized
in psychoanalysis , the ​deepestpart of the ​unconsciousmind that ​represents the most ​basicnaturalhumanneeds and ​emotions such as ​hunger, ​anger, and the ​wish for ​pleasure

I'd

uk   us   /aɪd/
short form of I had: I'd just got in the ​bath when the ​phonerang. short form of I would: Of ​course I'd ​love to ​see you.
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IDnoun

uk   us   /ˌaɪˈdiː/

id noun (DOCUMENT)

A2 [U] informal abbreviation for identification: any ​officialcard or ​document with ​yourname and ​photograph or other ​information on it that you use to ​prove who you are: Do you have any ID? A ​drivinglicence or ​chequecard will do.

id noun (ADDRESS)

written abbreviation for the US ​state of Idaho: used in ​addresses

IDverb [T]

uk   us   /ˌaɪˈdiː/ US informal
to ​look at a ​person or a ​body and say who that ​person is to someone in ​authority: He had to go to the ​morgue to ID the ​body.
(Definition of id from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "ID" - Business English Dictionary

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IDnoun

uk   us   /ˌaɪˈdiː/
[U or C] an ​officialcard or ​document with your ​name and photograph or other ​information on it, used for proving who you are. '"ID" is a ​shortform for "​identity" or "​identification": For ​legalimmigrants, a ​primary ID ​includes a ​greencard, ​authorization of ​employment from the Department of ​Justice or ​certificate of ​naturalization. Voters without ID may ​cast provisional ​ballots, but then must appear before their county ​clerk or ​board of ​elections within 10 days.carry/show/check ID You will need to show your ID before you can be ​admitted.
[C] (also identifier) IT a set of ​numbers, ​letters, or ​symbols that is used to ​represent a ​piece of ​data or a ​process in a ​computerprogram: The Vendor ID and Device ID ​registersidentify the ​device, and are commonly called the PCI ID.
See also

IDverb [T]

uk   us   (ID's, ID'ing, ID'd)
to ​officiallystate or prove who someone is, or to ​ask someone to show you an ​officialcard or ​document proving who they are: The ​defenseattorneymaintains that the ​defendant was wrongly ID'd by ​witnesses. If you ​look too young to ​buy alcohol, you will almost certainly be ID'd.
(Definition of ID from the Cambridge Business English Dictionary © Cambridge University Press)
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